/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements.
 * See the NOTICE file distributed with this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is
 * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and limitations under the License.
 *
 * =========================================================================================================
 *
 * This software consists of voluntary contributions made by many individuals on behalf of the
 * Apache Software Foundation. For more information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * +-------------------------------------------------------------------------------------------------------+
 * | License: http://www.apache.org/licenses/LICENSE-2.0.txt 										       |
 * | Author: Yong.Teng <webmaster@buession.com> 													       |
 * | Copyright @ 2013-2019 Buession.com Inc.														       |
 * +-------------------------------------------------------------------------------------------------------+
 */
package com.buession.aop.resolver;

import com.buession.aop.MethodInvocation;
import com.buession.core.utils.Assert;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;

/**
 * @author Yong.Teng
 */
public class DefaultAnnotationResolver extends AbstractAnnotationResolver {

    @Override
    public Annotation getAnnotation(MethodInvocation mi, Class<? extends Annotation> clazz){
        Assert.isNull(mi, "method arguments cloud not be null");

        Method method = mi.getMethod();
        if(method == null){
            throw new IllegalArgumentException(MethodInvocation.class.getName() + " parameter incorrectly " +
                    "constructed.getMethod() returned null");
        }

        Annotation annotation = method.getAnnotation(clazz);
        if(annotation == null){
            Object miThis = mi.getThis();
            annotation = miThis != null ? miThis.getClass().getAnnotation(clazz) : null;
        }

        return annotation;
    }

    @Override
    public Annotation getAnnotation(Method method, Class<? extends Annotation> clazz){
        Assert.isNull(method, "method arguments cloud not be null");

        Annotation annotation = method.getAnnotation(clazz);
        if(annotation == null){
            annotation = method.getDeclaringClass().getAnnotation(clazz);
        }

        return annotation;
    }
}
